Lumbar spinal stenosis usually happens when the nerves that travel down into the legs are put into pressure. This is because the spaces in the lower back becomes narrower. This usually happens over time, and not suddenly. At starting, it may be hard to notice any symptoms, but as it gets worse, the patient can suffer from pain, numbness or tingling in the legs more often. This is more common in older adults, as their spine becomes weak with age. This can also happen to younger people especially of they’ve suffered any injury or has any condition.